Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 59: Extended Higgs models II

T 59.9: Talk

Wednesday, March 17, 2021, 18:00–18:15, Ti

Search for a low mass charged Higgs decaying to cs — •Christian Nass, Tatjana Lenz, and Jochen Dingfelder — Physikalisches Institut, Universität Bonn, Deutschland

In the Standard Model (SM) electroweak symmetry breaking (EWSB) is introduced by a single complex scalar field. The consequence is the prediction of a scalar, neutrally charged particle, the Higgs Boson, which was discovered in 2012 at the LHC. The simplest extension of the SM is to introduce EWSB through two complex scalar fields. This theory is called two Higgs doublet model (2HDM) and is very prominent because it offers opportunity to include additional CP-violation in the SM, which is needed for explaining baryogenesis. It features 3 neutral and 2 charged Bosons. Observation of such a charged scalar would be a striking signal for physics beyond the SM.

In the low mass region, i.e. m_H^± < m_t, the dominant production mode is by a tt pair with one t-quark decaying to H^±b. It is advised by several theory papers to search for H^pm → cs decays in the low mass region. Compared to previous analyses the sensitivity is expected to be higher, because statistics is higher, b-tagging and other techniques improved, and the introduction of new tools, i.e. c-tagging or multivariate analysis techniques. This search in Run-2 ATLAS data at 13 TeV will be presented.